Grain bin



FIG. 1 is an isometric view taken from the top and one side of a grain bin showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and

FIG. 4 is an elevational view taken from the side opposite that shown in FIG. 1. 

The ornamental design of a grain bin, substantially as shown. 